MAX8815A

1A, 97% Efficiency, 30µA Quiescent Current, Step-Up Converter with True Shutdown

Highest Efficiency, 1A Output Boost Converter


Description

The MAX8815A DC-DC step-up converter is a high-efficiency, low quiescent current, synchronous step-up converter with True Shutdown™ and inrush-current limiting. The MAX8815A generates any output voltage from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell Li+/Li polymer battery.

The MAX8815A uses two modes of operation. The first mode of operation (normal) uses only 30µA (typ) quiescent current and allows the converter to switch only when needed at no load and light loads. Under moderate and heavy loads (typically above 90mA), the MAX8815A uses a fixed-frequency pulse-width modulation (PWM) technique. This mode allows maximum efficiency at light loads. The second mode of operation is a fixed-frequency forced-pulse-width modulation (FPWM) mode where the converter switches at a fixed frequency irrespective of the load. This mode allows for easy noise filtering and lower output ripple.

The MAX8815A has a preset 2.5A current limit, allowing 500mA load at 1.8V input and 1A load at 2.5V input when the output is set to 5V. Features include soft-start, which limits inrush current during startup, True Shutdown, and internal compensation. The MAX8815A is available in a compact 10-pin, 3mm x 3mm TDFN package.

The MAX8815A evaluation kit can help shorten the time required for system design.
MAX8815: Typical Application Circuits MAX8815: Typical Application Circuits Enlarge+

Key Features

  • Up to 97% Efficiency with Internal Synchronous Rectifier
  • Low 30µA Quiescent Current
  • Guaranteed 500mA Output Current at VOUT = 5V from 1.8V Input
  • Guaranteed 1A Output Current at 5V from 2.5V Input
  • Low-Noise Constant Frequency Operation (FPWM Mode)
  • 2MHz PWM Switching Frequency
  • Preset (5V) or Adjustable Output
  • Controlled Current in Soft-Start Limits Inrush Current
  • True Shutdown
  • Internal Compensation
  • Overload/Short-Circuit Protection
  • 0.1µA Shutdown Current
  • Thermal Shutdown
  • Compact 10-Pin, 3mm x 3mm TDFN Package

Applications/Uses

  • Cell Phones, PDAs, MP3 Players
  • DSC and DVC
  • Microprocessor/DSP Core Power
  • PCMCIA Cards
  • Portable Handheld Devices
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Output Adjust. Method Switch Type Synchronous Switching DC-DC Outputs Oper. Freq.
(kHz)
Package/Pins Budgetary
Price
min max min max max See Notes
MAX8815A  1.2 5.5 1.265 5.5 1 Resistor Internal Yes 1 2000
TDFN-EP/10
$1.23 @1k
See All Step-Up Switching Regulators (86)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX8815AEVKIT: Evaluation Kit for the MAX8815A

Tools & Models

MAX8815A PSPICE Macromodel

 

Related Resources


MAX77826
Power Management IC

  • Compact Total Solution Size Allows More Peripheral Devices in Smartphones and Tablets
  • Simple Management of Power-Up/Down Sequence, Output Voltage Setting, and Fault Detection

MAX17509
4.5V–16V, Dual 3A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Resistor Programmability

  • Reduces Number of DC-DC Regulators in Inventory
  • Mitigate Noise Concerns and EMI
  • Ease of System Design

MAX17542G
42V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter

  • Reduces External Components and Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX17521
60V, 1A, Dual-Output, High-Efficiency, Synchronous Step-Down DC-DC Converter

  • Reduces External Components and Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX15462
42V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters

  • Eliminates External Components and Reduces Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX17558
60V, Dual-Output, Synchronous Step-Down Controller

  • Wide Range of Operation
  • Enhances Power Efficiency
  • Operates Reliably in Adverse Industrial Environments

MAX17620
4MHz, Miniature 600mA, Synchronous Step-Down DC-DC Converter with Integrated MOSFETs

  • Minimizes External Components, Reducing Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX15301AA02
InTune Automatically Compensated Digital PoL Controller with Driver and PMBus Telemetry

  • InTune Automatic Compensation Ensures Stability While Optimizing Transient Performance
  • State-Space Compensation Results in Fast Transient Response with Reduced Output Capacitance
  • Differential Remote Voltage Sensing Enables ±1% VOUT Accuracy over Temperature (-40°C to +85°C)